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| 大通湖生态修复前后水体浮游植物调查及富营养化评价 |
| Phytoplankton Investigation and Eutrophication Evaluation Before and After Ecological Restoration in Datong Lake |
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| DOI： |
| 中文关键词: 浮游植物 群落结构 富营养化 生态修复 大通湖 |
| 英文关键词: Phytoplankton Community structure Eutrophication Ecological restoration Datong Lake |
| 基金项目:湖南省自然科学基金资助项目（2021JJ50135，2021JJ40379）；常德市科技创新专项基金资助项目（2020G178，2020S006） |
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| 中文摘要: |
| 2016—2021年夏秋季期间在大通湖布设18个采样点，对大通湖浮游植物及水体理化指标采样分析，并应用综合营养指数对其水质富营养状态进行评价。结果表明，调查期间大通湖浮游植物共鉴定出6门71属，以蓝藻门和绿藻门为主。生态修复后大通湖浮游植物细胞数和Chl a质量浓度呈显著上升趋势，2020年达峰值，分别为7.20×107 个/L和12.56μg/L。蓝藻门的优势地位逐渐加强，2016—2021年蓝藻门占比由42.8%增长至85.5%，其中微囊藻和长孢藻占据绝对优势地位。大通湖水质营养状态在沉水植物修复后2019年由轻度富营养短暂降为中营养水平，由于2019年冬季沉水植物消亡及次年未复苏，2020年又反弹为中度富营养状态。 |
| 英文摘要: |
| 18 sampling sites were set up in Datong Lake during the summer and autumn of 2016—2021. The phytoplankton and physicochemical indexes were sampled and analyzed, and the eutrophication status of water quality was evaluated by the comprehensive nutrient index. The results showed that 71 genera of phytoplankton in 6 phyla were identified in Datong Lake during the investigation period, maily Cyanophyta and Chlorophyta. The phytoplankton cell number and Chl a concentration in Datong Lake showed a significant upward trend after ecological restoration, reaching the peak in 2020, which were 7.20×107 cells/L and 12.56μg/L respectively. The dominant position of Cyanophyta was gradually strengthened, the proportion of Cyanophyta increased from 42.8% to 85.5% during 2016—2021,in which Microcystis spp. and Dolichospermum spp. were in an absolutely dominant position. The water nutritional status of Datong Lake briefly decreased from mild entrophication to medium nutrient in 2019 after submerged plant restoration. As the submerged plants died out in the winter of 2019 and failed to recover the following year, the water quality rebounded to moderate eutrophication in 2020. |
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